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WO1995010841A1 - Mecanisme d'obturateur pour collimater les rayons x - Google Patents

Mecanisme d'obturateur pour collimater les rayons x Download PDF

Info

Publication number
WO1995010841A1
WO1995010841A1 PCT/US1994/011522 US9411522W WO9510841A1 WO 1995010841 A1 WO1995010841 A1 WO 1995010841A1 US 9411522 W US9411522 W US 9411522W WO 9510841 A1 WO9510841 A1 WO 9510841A1
Authority
WO
WIPO (PCT)
Prior art keywords
shutter
frame
flexible band
opening
interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1994/011522
Other languages
English (en)
Inventor
Howard C. Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1995010841A1 publication Critical patent/WO1995010841A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers

Definitions

  • Shutter mechanisms for x-ray collimators present a unique set of design requirements.
  • the shutters are typically made of a radio-opaque material, such as lead. This results in shutter plates that have substantial weight.
  • x-ray diagnostic devices used in medical and dental offices are subject to very tight space limitations. Therefore, the shutter mechanism must be as compact as possible.
  • safety of the patient and health care providers is always a paramount concern. This dictates that the shutter mechanism must be capable of a high degree of positional accuracy to ensure an accurate x-ray dosage to the patient through a well-defined aperture and to prevent accidental exposure of others.
  • the Cutter patents disclose two variations of a compact collimator with two orthogonally-disposed pairs of shutters. Mating inner edges of each pair move in a rectilinear path.
  • St ⁇ dberg et al., Fekete, and Peyser disclose other examples of x-ray collimators using mechanical linkages and/or gears to control the position of shutters.
  • a primary object of the present invention is to provide a shutter mechanism for collimating x-rays that requires a substantially reduced number of component parts, thereby decreasing the cost of production and increasing reliability.
  • Another object of the present invention is to provide a shutter mechanism that can be easily repaired.
  • Yet another object of the present invention is to provide a shutter mechanism that is very compact and can be easily stacked for two-dimensional control of the shutter aperture.
  • FIG. 1 is a front plan view of a shutter assembly showing the frame and two shutters.
  • FIG. 3 is cross-sectional view of the left edge of the shutter assembly as indicated in FIG. 1.
  • FIG. 8 is a rear plan view of the shutter assembly.
  • FIG. 9 is a top plan view of two shutter assemblies that have been orthogonally stacked to provide two-dimensional control of the aperture size.
  • FIG. 1 a front plan view of one shutter assembly 10 is provided.
  • a corresponding side plan view is shown in FIG. 2 and a rear plan view is shown in FIG. 8.
  • the frame 12 defines an opening 13 with two opposed interior edges 14, 16 that extend generally parallel to the direction of motion for the two shutter members 20 and 30.
  • the opening 13 can be substantially rectangular in shape, although other geometric shapes having at least two opposing edges could be employed.
  • the plane of the frame opening 13 is usually substantially normal to the axis of the x-ray beam being collimated.
  • first track 35 extends along the lower portion of the first interior edge 14 of the frame 12 and slidably engages the second end 33 of the second shutter member 30.
  • second track 25 extends along the upper portion of the second interior edge 16 of the frame 12 and slidably engages the second end 23 of the first shutter member 20.
  • first track 35 is located across the frame opening 13 from the second slot 34
  • second track 25 is located across the frame opening from the first slot 24.
  • FIGS. 4 and 5 demonstrate how the shutter members move between an open position (FIG. 4) and a closed position (FIG. 5) as the stepper motor 50 causes the flexible band 40 to translate within the channel 18 relative to the frame 12.
  • the slots 24, 34 and/or tracks 25, 25 can be used to define the maximum range of motion for the shutter members 20, 30 within the frame opening 13.
  • the band 40 pulls on the first shutter member 20 and pushes on the second shutter member 30 to open the shutter aperture.
  • the band 40 and channel 18 extend completely around the periphery of the frame opening to form a complete loop, the band 40 will simultaneously pull on both shutter members 20 and 30, and thereby eliminate any potential problem of buckling.
  • FIG. 9 shows multiple shutter assemblies 110 and 210 orthogonally stacked along a common axis to provide two-dimensional control of the size and shape of the resulting aperture.
  • FIG. 10 is a side cross- sectional view of the two orthogonally stacked shutter assemblies 110, 210 incorporated into a conventional x-ray generator.
  • Each of the shutter assemblies 110, 210 has essentially the same configuration and components as the shutter assembly 10 previously discussed and shown in FIGS. 1 - 9.
  • the frame opening of each shutter assembly is substantially orthogonal to a common axis passing through the x-ray source 300.
  • the shutter assemblies 110 and 210 are oriented substantially orthogonally to one another (i.e., the shutter assemblies are rotated 90 degrees with respect to one another about the common axis) .
  • a single stepper motor and a single flexible band can be use to position more than two shutter members within a single frame.
  • two pairs of shutter members can be driven by the same band in a square or rectangular frame opening.
  • the first pair of shutter members is attached to the band along the top and bottom interior edges of the frame to regulate the aperture size in the X direction.
  • the second pair of shutter members is attached to the band along the left and right interior edges of the frame to regulate the aperture size in the Y direction.
  • This concept could be further extended to provide three pairs of shutter members attached to opposing pairs of edges in a hexagonal frame, or four pairs of shutter members in an octagonal frame, etc.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

Dans un mécanisme d'obturateur (10) pour collimater les rayons X, un cadre (12) définit une ouverture (13), avec des premier et deuxième bords (14, 16) intérieurs opposés. Une bande flexible allongée (40) s'étend, de manière à coulisser, sur la périphérie du cadre. Une première extrémité de premier et deuxième organes (20, 30) d'obturateur opaque aux rayons X est fixée à la bande le long des premier et deuxième bords. Un moteur assure le déplacement en translation de la bande (40) pour contrôler les organes (20, 30) qui limitent une ouverture (13). Des glissières (25, 35) sont ménagées dans les bords (14, 16). Au moins deux ensembles de cadres (110, 210) peuvent être empilés autour d'un axe commun pour contrôler la taille de l'ouverture en deux dimensions.
PCT/US1994/011522 1993-10-12 1994-10-11 Mecanisme d'obturateur pour collimater les rayons x Ceased WO1995010841A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/135,090 US5396534A (en) 1993-10-12 1993-10-12 Shutter apparatus for collimating x-rays
US135,090 1993-10-12

Publications (1)

Publication Number Publication Date
WO1995010841A1 true WO1995010841A1 (fr) 1995-04-20

Family

ID=22466493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/011522 Ceased WO1995010841A1 (fr) 1993-10-12 1994-10-11 Mecanisme d'obturateur pour collimater les rayons x

Country Status (2)

Country Link
US (1) US5396534A (fr)
WO (1) WO1995010841A1 (fr)

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FR2818428A1 (fr) * 2000-12-19 2002-06-21 Ge Med Sys Global Tech Co Llc Collimateur ajustable
JP3947372B2 (ja) * 2001-07-25 2007-07-18 ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー Ｘ線ｃｔシステムにおけるアパーチャの位置調整機構およびガントリ装置ならびにその制御方法
DE10162256B4 (de) * 2001-12-18 2004-09-09 Siemens Ag Strahlenblende für ein Röntgengerät
EP1686897B1 (fr) * 2003-11-20 2010-08-11 GE Medical Systems Global Technology Company LLC Collimateur, irradiateur aux rayons x, et appareil rayons x
EP1720453B1 (fr) * 2004-03-04 2010-04-28 Lodox Systems (Proprietary) Limited Appareil de balayage aux rayons x
CN100483564C (zh) * 2005-09-22 2009-04-29 同方威视技术股份有限公司 一种用于调整x射线束流的准直器
US7388207B1 (en) * 2006-03-28 2008-06-17 University Of Utah Research Foundation Skew slit collimator and method of use thereof
EP1916694A1 (fr) * 2006-10-25 2008-04-30 ICT, Integrated Circuit Testing Gesellschaft für Halbleiterprüftechnik Mbh Diaphragme ajustable pour un dispositif à faisceau de particules chargées, son mode opératoire et son procédé de fabrication
DE102007028902B4 (de) * 2007-06-22 2009-04-16 Siemens Ag Strahlerblende, Verfahren zu deren Steuerung und Röntgen-CT-Vorrichtung mit derartiger Strahlerblende
US8093572B2 (en) * 2007-06-29 2012-01-10 Accuray Incorporated Integrated variable-aperture collimator and fixed-aperture collimator
US8017915B2 (en) 2008-03-14 2011-09-13 Reflexion Medical, Inc. Method and apparatus for emission guided radiation therapy
US8085903B2 (en) * 2008-09-10 2011-12-27 Thomas Howard C Shutter mechanism for collimating X-rays
CN101859608B (zh) * 2009-04-09 2014-07-09 Ge医疗系统环球技术有限公司 刀片装置及x射线成像仪
CN110585607B (zh) 2011-03-31 2022-07-19 反射医疗公司 用于在发射引导的放射治疗中使用的系统和方法
CN102525542B (zh) * 2011-12-29 2013-06-26 北京长城电子装备有限责任公司 一种医用x光限束器遮光机构及其时序控制方法
US10367403B2 (en) * 2014-08-21 2019-07-30 General Electric Company Systems and methods for independent motion of parallel actuators
US10500416B2 (en) 2015-06-10 2019-12-10 Reflexion Medical, Inc. High bandwidth binary multi-leaf collimator design
JP6889495B2 (ja) 2016-03-09 2021-06-18 リフレクション メディカル， インコーポレイテッド 放射線療法のためのフルエンスマップ生成方法
WO2018093849A1 (fr) 2016-11-15 2018-05-24 Reflexion Medical, Inc. Procédés destinés à l'administration d'un rayonnement en radiothérapie guidée par émission
CN116943051A (zh) 2016-11-15 2023-10-27 反射医疗公司 放射治疗患者平台
EP3988017A1 (fr) 2016-11-15 2022-04-27 RefleXion Medical, Inc. Système d'administration de photons à haute énergie guidé par émission
WO2018183748A1 (fr) 2017-03-30 2018-10-04 Reflexion Medical, Inc. Systèmes et procédés de radiothérapie avec suivi de tumeur
EP3651851B1 (fr) 2017-07-11 2023-11-08 RefleXion Medical, Inc. Procédés de gestion de rémanence pour détecteur tep
JP7315961B2 (ja) 2017-08-09 2023-07-27 リフレクション メディカル， インコーポレイテッド 放出誘導放射線療法における異常検出のためのシステムおよび方法
WO2019099551A1 (fr) 2017-11-14 2019-05-23 Reflexion Medical, Inc. Systèmes et méthodes de surveillance d'un patient pour radiothérapie
KR102096416B1 (ko) * 2018-02-27 2020-04-02 포항공과대학교 산학협력단 엑스레이 셔터 장치 및 이를 이용한 엑스레이 셔터 개폐 시스템
US10658089B2 (en) * 2018-09-29 2020-05-19 Uih America, Inc. Motion guidance assembly for a collimator device
US10881371B2 (en) 2018-12-27 2021-01-05 Medtronic Navigation, Inc. System and method for imaging a subject
US10888294B2 (en) 2018-12-27 2021-01-12 Medtronic Navigation, Inc. System and method for imaging a subject
US11071507B2 (en) 2018-12-27 2021-07-27 Medtronic Navigation, Inc. System and method for imaging a subject
KR20220062040A (ko) 2019-09-12 2022-05-13 올쏘스캔 인코포레이티드 무단 시준을 갖는 미니 c-아암 촬상 시스템
US11259769B2 (en) * 2020-05-07 2022-03-01 X-Ray Cassette Repair, Inc Image capture method and apparatus

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US4489426A (en) * 1981-12-23 1984-12-18 General Electric Company Collimator with adjustable aperture

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